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samples-module-loading-comparison

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Some tests for comparing performance between bundling and unbundling JS

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# Browser module loading tests

This sample takes moment.js and three.js, and prepares them for loading in the
browser with ECMAScript modules.

## Development

### Cloning this repository

Standard stuff :) Hit the "Clone or download" button in the project's GitHub
landing page and go from there.

### Installing dependencies

NPM packages need to be installed on the root and both `src/` subdirectories.

```sh
npm i
```

Gulp needs to be available globally. You can install it by doing:

```sh
npm i -g gulp
```

### Building and developing

```sh
gulp build
```

### Running the HTTP server

First add `cert.pem` and `key.pem` files for TLS. If you don't have these, you
can use [simplehttp2server](https://github.com/GoogleChrome/simplehttp2server)
to generate them for you. Place them at the root of the clone.

Then:

```sh
go run server/server.go
```

Or, if you don't have `go` command, you can use the built in HTTP server instead:

```sh
gulp serve
```

HTTP server command line options:
- `--http1`: serve over HTTP/1.1 instead of HTTP/2
- `--push`: use HTTP/2 push when serving
- `--preload`: inject `<link rel="preload">` tags for JS dependencies when serving

E.g., to serve over HTTP/1.1 with preload enabled:

```sh
go run server/server.go --http1 --preload
```

### Bundled / unbundled tests

The bundled / unbundled test cases are served at the following URLs:

* moment.js
  * bundled, optimized:   https://localhost:44333/moment/bundled-optimized.html
  * bundled, unoptimized: https://localhost:44333/moment/bundled-unoptimized.html
  * unbundled:            https://localhost:44333/moment/unbundled.html
* three.js
  * bundled, optimized:   https://localhost:44333/three/bundled-optimized.html
  * bundled, unoptimized: https://localhost:44333/three/bundled-unoptimized.html
  * unbundled:            https://localhost:44333/three/unbundled.html

These tests load the files only once, so the results may be noisy. At the
toplevel test page https://localhost:44333/ you can run the unbundled test cases
repeatedly (25 times) and see the median time.

### Synthesized module tree tests

In addition to the real-world library test cases, this HTTP server provides
a benchmark for artificial module tree shapes. This is served at
https://localhost:44333/synthesized/ and it accepts the following query
parameters:

- `depth` (default: 5):   height of the module dependency tree
- `branch` (default: 2):  number of child modules non-leaf modules have
- `delay=n` (optional):   sleep n milliseconds in response handler
- `cacheable` (optional): make JavaScript resources cacheable

E.g., this loads a module whose dependency tree is a perfect binary tree of
depth 10 (2047 modules in total):
https://localhost:44333/synthesized/?depth=10&branch=2

Note: Currently, --push and --preload options are not supported in synthesized
tests.

### [Experimental] WebBundle tests

[Web Bundle](https://wicg.github.io/webpackage/draft-yasskin-wpack-bundled-exchanges.html)
is a file format for encapsulating one or more HTTP resources. It allows
distributing a large number of module scripts as a single HTTP resource.

You need [WebBundle Go tools](https://github.com/WICG/webpackage/tree/master/go/bundle)
to generate Web Bundles, which can be installed by this command:
```
go get -u github.com/WICG/webpackage/go/bundle/cmd/...
```
Then, this command will generate Web Bundles for the moment.js / three.js tests:
```
./gen-bundles.sh
```

As of April 2020, Web Bundles support is implemented only in Chromium-based
browsers, behind an experimental feature flag. To enable Web Bundles in Chrome,
turn on `chrome://flags/#web-bundles` flag.

After enabling the flag, drag and drop `samples-module-loading-comparison.wbn`
into Chrome to open it. An index page will be displayed from which you can
choose a benchmark to run.

`gen-bundles.sh` also generates `dist/moment/momentjs.wbn` and
`dist/three/threejs.wbn`. They only bundle the module scripts for each test.
These can be used with `dist/{moment,three}/webbundle.html` to test
[Subresource loading with Web Bundles](https://github.com/WICG/webpackage/blob/master/explainers/subresource-loading.md).
(Note: this is a proposal in very early stage; experimental implementation
is not landed in any browsers as of April 2020.)

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